摘要
提出了一种改进的空化模型和算法,同时耦合考虑黏性效应的Navier-Stokes方程求解方法,用数值研究了附着空化流动.提出的空化模型和算法将气相/液相界面作为流动区域的自由界面,并满足当地气相压力进行处理,空化空腔的形状通过迭代计算进行修正得到,不仅考虑了流场的压力分布,而且考虑了气相/液相界面处的压力梯度信息.采用具有试验数据的半球形头部圆柱体空化绕流作为算例,考核了所提出空化模型和算法的网格无关性,并研究了迭代修正格式中松弛因子对算法精度和计算效率的影响特性.研究表明,圆锥形头部圆柱体空化绕流的数值模拟结果与其试验数据吻合良好,证明了所提出的空化模型和算法的可靠性.
An improved cavitation model and algorithms for attached cavitating flows were presented. The cavitation model was coupled with a viscous Navier-Stokes solution. The vapor/liquid interface was treated as a free boundary and its shape was determined using an iterative procedure to match the cavity surface to a constant pressure boundary. The pressure distribution, as well as its gradient on the wall, was taken into account in updating the cavity shape iteratively. The attached cavitating flows across a hemisphere headform/cylinder body were simulated using different grid numbers and relaxation factors to test the feasibility of the present model Numerical computations were performed for flows with and without cavitation passing a cone headform/cylinder body. The comparison of numerical results with experimental data shows the accuracy and relia bility of the present attached cavitation model and algorithms.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2006年第3期253-256,共4页
Journal of Xi'an Jiaotong University
基金
教育部高等学校博士学科点专项科研基金资助项目(20040698049)
西安交通大学自然科学基金资助项目(2003)
